Gear Ratio

Gear ratio is the number of revolutions from one
gear to the next. It depends on the number of teeth.

For example,
These gears each have differing angular velocity.

For example, if implemented in Houdini, the red gear could be
rotating at say -$F (frames per second), call this the
rotateRedGear
Then the green gear next to it, with 8 teeth, would rotate at a
rate of -ch("../rotateRedGear/rz") * 12 / 8
Then the blue gear next to that one, with 6 teeth would rotate
at a rate of -ch("../rotateGreenGear/rz") * 8 / 6